Question 906501
{{{F(x)= abs(x-4) }}} is same as {{{F(x)= (+-sqrt((x-4)^2))}}}

so, {{{F(x)= abs(x-4)}}} is {{{F(x)=x-4}}} or {{{F(x)=-(x-4)=-x+4}}} 


{{{ graph( 600, 600, -10, 10, -5, 10, abs(x-4)) }}}